xref: /packages/apps/LegacyCamera/src/com/android/camera/Camera.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.camera;

import com.android.camera.ui.CameraHeadUpDisplay;
import com.android.camera.ui.CameraPicker;
import com.android.camera.ui.FocusRectangle;
import com.android.camera.ui.GLRootView;
import com.android.camera.ui.HeadUpDisplay;
import com.android.camera.ui.IndicatorWheel;
import com.android.camera.ui.ZoomControllerListener;
import com.android.camera.ui.ZoomPicker;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ContentProviderClient;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences.Editor;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.Size;
import android.location.Location;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.media.AudioManager;
import android.media.ToneGenerator;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.MessageQueue;
import android.os.SystemClock;
import android.provider.MediaStore;
import android.provider.Settings;
import android.provider.MediaStore.Images.ImageColumns;
import android.provider.MediaStore.Images.Media;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.OrientationEventListener;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.view.Window;
import android.view.WindowManager;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

/** The Camera activity which can preview and take pictures. */
public class Camera extends ActivityBase implements View.OnClickListener,
        ShutterButton.OnShutterButtonListener, SurfaceHolder.Callback,
        Switcher.OnSwitchListener {

    private static final String TAG = "camera";

    private static final String LAST_THUMB_PATH =
            Storage.THUMBNAILS + "/image_last_thumb";

    private static final int CROP_MSG = 1;
    private static final int FIRST_TIME_INIT = 2;
    private static final int RESTART_PREVIEW = 3;
    private static final int CLEAR_SCREEN_DELAY = 4;
    private static final int SET_CAMERA_PARAMETERS_WHEN_IDLE = 5;
    private static final int CHECK_DISPLAY_ROTATION = 6;

    // The subset of parameters we need to update in setCameraParameters().
    private static final int UPDATE_PARAM_INITIALIZE = 1;
    private static final int UPDATE_PARAM_ZOOM = 2;
    private static final int UPDATE_PARAM_PREFERENCE = 4;
    private static final int UPDATE_PARAM_ALL = -1;

    // When setCameraParametersWhenIdle() is called, we accumulate the subsets
    // needed to be updated in mUpdateSet.
    private int mUpdateSet;

    // The brightness settings used when it is set to automatic in the system.
    // The reason why it is set to 0.7 is just because 1.0 is too bright.
    private static final float DEFAULT_CAMERA_BRIGHTNESS = 0.7f;

    private static final int SCREEN_DELAY = 2 * 60 * 1000;
    private static final int FOCUS_BEEP_VOLUME = 100;

    private static final int ZOOM_STOPPED = 0;
    private static final int ZOOM_START = 1;
    private static final int ZOOM_STOPPING = 2;

    private int mZoomState = ZOOM_STOPPED;
    private boolean mSmoothZoomSupported = false;
    private int mZoomValue;  // The current zoom value.
    private int mZoomMax;
    private int mTargetZoomValue;
    private ZoomPicker mZoomPicker;

    private Parameters mParameters;
    private Parameters mInitialParams;

    private MyOrientationEventListener mOrientationListener;
    // The device orientation in degrees. Default is unknown.
    private int mOrientation = OrientationEventListener.ORIENTATION_UNKNOWN;
    // The orientation compensation for icons and thumbnails.
    private int mOrientationCompensation = 0;
    private ComboPreferences mPreferences;

    private static final int IDLE = 1;
    private static final int SNAPSHOT_IN_PROGRESS = 2;

    private static final boolean SWITCH_CAMERA = true;
    private static final boolean SWITCH_VIDEO = false;

    private int mStatus = IDLE;
    private static final String sTempCropFilename = "crop-temp";

    private android.hardware.Camera mCameraDevice;
    private ContentProviderClient mMediaProviderClient;
    private SurfaceView mSurfaceView;
    private SurfaceHolder mSurfaceHolder = null;
    private ShutterButton mShutterButton;
    private FocusRectangle mFocusRectangle;
    private ToneGenerator mFocusToneGenerator;
    private GestureDetector mPopupGestureDetector;
    private SwitcherSet mSwitcher;
    private boolean mStartPreviewFail = false;

    private GLRootView mGLRootView;

    // The last captured picture.
    private RotateImageView mThumbnailButton;

    // mCropValue and mSaveUri are used only if isImageCaptureIntent() is true.
    private String mCropValue;
    private Uri mSaveUri;

    // GPS on-screen indicator
    private View mGpsNoSignalView;
    private View mGpsHasSignalView;

    // Front/Back camera pciker for xlarge layout
    private CameraPicker mCameraPicker;

    /**
     * An unpublished intent flag requesting to return as soon as capturing
     * is completed.
     *
     * TODO: consider publishing by moving into MediaStore.
     */
    private final static String EXTRA_QUICK_CAPTURE =
            "android.intent.extra.quickCapture";

    private boolean mPreviewing;
    // The display rotation in degrees. This is only valid when mPreviewing is
    // true.
    private int mDisplayRotation;
    private boolean mPausing;
    private boolean mFirstTimeInitialized;
    private boolean mIsImageCaptureIntent;
    private boolean mRecordLocation;

    private static final int FOCUS_NOT_STARTED = 0;
    private static final int FOCUSING = 1;
    private static final int FOCUSING_SNAP_ON_FINISH = 2;
    private static final int FOCUS_SUCCESS = 3;
    private static final int FOCUS_FAIL = 4;
    private int mFocusState = FOCUS_NOT_STARTED;

    private ContentResolver mContentResolver;
    private boolean mDidRegister = false;

    private final ArrayList<MenuItem> mGalleryItems = new ArrayList<MenuItem>();

    private LocationManager mLocationManager = null;

    private final ShutterCallback mShutterCallback = new ShutterCallback();
    private final PostViewPictureCallback mPostViewPictureCallback =
            new PostViewPictureCallback();
    private final RawPictureCallback mRawPictureCallback =
            new RawPictureCallback();
    private final AutoFocusCallback mAutoFocusCallback =
            new AutoFocusCallback();
    private final ZoomListener mZoomListener = new ZoomListener();
    private final CameraErrorCallback mErrorCallback = new CameraErrorCallback();

    private long mFocusStartTime;
    private long mFocusCallbackTime;
    private long mCaptureStartTime;
    private long mShutterCallbackTime;
    private long mPostViewPictureCallbackTime;
    private long mRawPictureCallbackTime;
    private long mJpegPictureCallbackTime;
    private long mOnResumeTime;
    private long mPicturesRemaining;
    private byte[] mJpegImageData;

    // These latency time are for the CameraLatency test.
    public long mAutoFocusTime;
    public long mShutterLag;
    public long mShutterToPictureDisplayedTime;
    public long mPictureDisplayedToJpegCallbackTime;
    public long mJpegCallbackFinishTime;

    // Focus mode. Options are pref_camera_focusmode_entryvalues.
    private String mFocusMode;
    private String mSceneMode;
    private Toast mNotSelectableToast;

    private final Handler mHandler = new MainHandler();
    // xlarge devices use indicator wheel. Other devices use head-up display.
    private CameraHeadUpDisplay mHeadUpDisplay;
    private IndicatorWheel mIndicatorWheel;
    private PreferenceGroup mPreferenceGroup;

    // multiple cameras support
    private int mNumberOfCameras;
    private int mCameraId;
    private int mFrontCameraId;
    private int mBackCameraId;

    private boolean mQuickCapture;

    /**
     * This Handler is used to post message back onto the main thread of the
     * application
     */
    private class MainHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case RESTART_PREVIEW: {
                    restartPreview();
                    if (mJpegPictureCallbackTime != 0) {
                        long now = System.currentTimeMillis();
                        mJpegCallbackFinishTime = now - mJpegPictureCallbackTime;
                        Log.v(TAG, "mJpegCallbackFinishTime = "
                                + mJpegCallbackFinishTime + "ms");
                        mJpegPictureCallbackTime = 0;
                    }
                    break;
                }

                case CLEAR_SCREEN_DELAY: {
                    getWindow().clearFlags(
                            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                    break;
                }

                case FIRST_TIME_INIT: {
                    initializeFirstTime();
                    break;
                }

                case SET_CAMERA_PARAMETERS_WHEN_IDLE: {
                    setCameraParametersWhenIdle(0);
                    break;
                }

                case CHECK_DISPLAY_ROTATION: {
                    // Restart the preview if display rotation has changed.
                    // Sometimes this happens when the device is held upside
                    // down and camera app is opened. Rotation animation will
                    // take some time and the rotation value we have got may be
                    // wrong. Framework does not have a callback for this now.
                    if (Util.getDisplayRotation(Camera.this) != mDisplayRotation
                            && isCameraIdle()) {
                        restartPreview();
                    }
                    if (SystemClock.uptimeMillis() - mOnResumeTime < 5000) {
                        mHandler.sendEmptyMessageDelayed(CHECK_DISPLAY_ROTATION, 100);
                    }
                    break;
                }
            }
        }
    }

    private void resetExposureCompensation() {
        String value = mPreferences.getString(CameraSettings.KEY_EXPOSURE,
                CameraSettings.EXPOSURE_DEFAULT_VALUE);
        if (!CameraSettings.EXPOSURE_DEFAULT_VALUE.equals(value)) {
            Editor editor = mPreferences.edit();
            editor.putString(CameraSettings.KEY_EXPOSURE, "0");
            editor.apply();
            if (mHeadUpDisplay != null) {
                mHeadUpDisplay.reloadPreferences();
            }
        }
    }

    private void keepMediaProviderInstance() {
        // We want to keep a reference to MediaProvider in camera's lifecycle.
        // TODO: Utilize mMediaProviderClient instance to replace
        // ContentResolver calls.
        if (mMediaProviderClient == null) {
            mMediaProviderClient = getContentResolver()
                    .acquireContentProviderClient(MediaStore.AUTHORITY);
        }
    }

    // Snapshots can only be taken after this is called. It should be called
    // once only. We could have done these things in onCreate() but we want to
    // make preview screen appear as soon as possible.
    private void initializeFirstTime() {
        if (mFirstTimeInitialized) return;

        // Create orientation listenter. This should be done first because it
        // takes some time to get first orientation.
        mOrientationListener = new MyOrientationEventListener(Camera.this);
        mOrientationListener.enable();

        // Initialize location sevice.
        mLocationManager = (LocationManager)
                getSystemService(Context.LOCATION_SERVICE);
        mRecordLocation = RecordLocationPreference.get(
                mPreferences, getContentResolver());
        initGpsOnScreenIndicator();
        if (mRecordLocation) startReceivingLocationUpdates();

        keepMediaProviderInstance();
        checkStorage();

        // Initialize last picture button.
        mContentResolver = getContentResolver();
        if (!mIsImageCaptureIntent)  {
            findViewById(R.id.camera_switch).setOnClickListener(this);
            initThumbnailButton();
        }

        // Initialize shutter button.
        mShutterButton = (ShutterButton) findViewById(R.id.shutter_button);
        mShutterButton.setOnShutterButtonListener(this);
        mShutterButton.setVisibility(View.VISIBLE);

        mFocusRectangle = (FocusRectangle) findViewById(R.id.focus_rectangle);
        updateFocusIndicator();

        initializeScreenBrightness();
        installIntentFilter();
        initializeFocusTone();
        initializeZoom();
        // xlarge devices use indicator wheel. Other devices use head-up display.
        if (mIndicatorWheel == null) {
            mHeadUpDisplay = new CameraHeadUpDisplay(this);
            mHeadUpDisplay.setListener(new MyHeadUpDisplayListener());
            initializeHeadUpDisplay();
        }
        mFirstTimeInitialized = true;
        changeHeadUpDisplayState();
        addIdleHandler();
    }

    private void addIdleHandler() {
        MessageQueue queue = Looper.myQueue();
        queue.addIdleHandler(new MessageQueue.IdleHandler() {
            public boolean queueIdle() {
                Storage.ensureOSXCompatible();
                return false;
            }
        });
    }

    private void initThumbnailButton() {
        mThumbnailButton =
                (RotateImageView) findViewById(R.id.review_thumbnail);
        if (mThumbnailButton != null) {
            mThumbnailButton.setOnClickListener(this);
            mThumbnailButton.loadData(LAST_THUMB_PATH);
            updateThumbnailButton();
        }
    }

    private void updateThumbnailButton() {
        if (mThumbnailButton == null) return;
        // Update last image if URI is invalid and the storage is ready.
        if (!mThumbnailButton.isUriValid() && mPicturesRemaining >= 0) {
            Storage.Thumbnail thumbnail =
                    Storage.getLastImageThumbnail(mContentResolver);
            if (thumbnail != null) {
                mThumbnailButton.setData(thumbnail.getOriginalUri(),
                        thumbnail.getBitmap(mContentResolver));
            } else {
                mThumbnailButton.setData(null, null);
            }
        }
        mThumbnailButton.setVisibility(
                (mThumbnailButton.getUri() != null) ? View.VISIBLE : View.GONE);
    }

    // If the activity is paused and resumed, this method will be called in
    // onResume.
    private void initializeSecondTime() {
        // Start orientation listener as soon as possible because it takes
        // some time to get first orientation.
        mOrientationListener.enable();

        // Start location update if needed.
        mRecordLocation = RecordLocationPreference.get(
                mPreferences, getContentResolver());
        if (mRecordLocation) startReceivingLocationUpdates();

        installIntentFilter();
        initializeFocusTone();
        initializeZoom();
        changeHeadUpDisplayState();

        keepMediaProviderInstance();
        checkStorage();

        if (!mIsImageCaptureIntent) {
            updateThumbnailButton();
        }
    }

    private void initializeZoom() {
        if (!mParameters.isZoomSupported()) return;

        mZoomMax = mParameters.getMaxZoom();
        mSmoothZoomSupported = mParameters.isSmoothZoomSupported();
        if (mZoomPicker != null) {
            mZoomPicker.setZoomRatios(getZoomRatios());
            mZoomPicker.setZoomIndex(mParameters.getZoom());
            mZoomPicker.setSmoothZoomSupported(mSmoothZoomSupported);
            mZoomPicker.setOnZoomChangeListener(
                    new ZoomPicker.OnZoomChangedListener() {
                // only for immediate zoom
                public void onZoomValueChanged(int index) {
                    Camera.this.onZoomValueChanged(index);
                }

                // only for smooth zoom
                public void onZoomStateChanged(int state) {
                    if (mPausing) return;

                    Log.v(TAG, "zoom picker state=" + state);
                    if (state == mZoomPicker.ZOOM_IN) {
                        Camera.this.onZoomValueChanged(mZoomMax);
                    } else if (state == mZoomPicker.ZOOM_OUT){
                        Camera.this.onZoomValueChanged(0);
                    } else {
                        mTargetZoomValue = -1;
                        if (mZoomState == ZOOM_START) {
                            mZoomState = ZOOM_STOPPING;
                            mCameraDevice.stopSmoothZoom();
                        }
                    }
                }
            });
        }

        mCameraDevice.setZoomChangeListener(mZoomListener);
    }

    private void onZoomValueChanged(int index) {
        // Not useful to change zoom value when the activity is paused.
        if (mPausing) return;

        if (mSmoothZoomSupported) {
            if (mTargetZoomValue != index && mZoomState != ZOOM_STOPPED) {
                mTargetZoomValue = index;
                if (mZoomState == ZOOM_START) {
                    mZoomState = ZOOM_STOPPING;
                    mCameraDevice.stopSmoothZoom();
                }
            } else if (mZoomState == ZOOM_STOPPED && mZoomValue != index) {
                mTargetZoomValue = index;
                mCameraDevice.startSmoothZoom(index);
                mZoomState = ZOOM_START;
            }
        } else {
            mZoomValue = index;
            setCameraParametersWhenIdle(UPDATE_PARAM_ZOOM);
        }
    }

    private float[] getZoomRatios() {
        if(!mParameters.isZoomSupported()) return null;
        List<Integer> zoomRatios = mParameters.getZoomRatios();
        float result[] = new float[zoomRatios.size()];
        for (int i = 0, n = result.length; i < n; ++i) {
            result[i] = (float) zoomRatios.get(i) / 100f;
        }
        return result;
    }

    private int mLocation[] = new int[2];
    private class PopupGestureListener extends
            GestureDetector.SimpleOnGestureListener {
        public boolean onDown(MotionEvent e) {
            // Check if the popup window is visible.
            View v = mIndicatorWheel.getActivePopupWindow();
            if (v == null) return false;

            int x = Math.round(e.getX());
            int y = Math.round(e.getY());

            // Dismiss the popup window if users touch on the outside.
            v.getLocationOnScreen(mLocation);
            if (x < mLocation[0] || (x > mLocation[0] + v.getWidth())
                    || y < mLocation[1] || (y > mLocation[1] + v.getHeight())) {
                // Let indicator wheel handle its own event.
                mIndicatorWheel.getLocationOnScreen(mLocation);
                if (x < mLocation[0] || (x > mLocation[0] + mIndicatorWheel.getWidth())
                        || y < mLocation[1] || (y > mLocation[1] + mIndicatorWheel.getHeight())) {
                    mIndicatorWheel.dismissSettingPopup();
                }
                // Let event fall through.
            }
            return false;
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent m) {
        // Check if the popup window should be dismissed first.
        if (mPopupGestureDetector != null && mPopupGestureDetector.onTouchEvent(m)) {
            return true;
        }

        return super.dispatchTouchEvent(m);
    }

    LocationListener [] mLocationListeners = new LocationListener[] {
            new LocationListener(LocationManager.GPS_PROVIDER),
            new LocationListener(LocationManager.NETWORK_PROVIDER)
    };

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(Intent.ACTION_MEDIA_MOUNTED)
                    || action.equals(Intent.ACTION_MEDIA_UNMOUNTED)
                    || action.equals(Intent.ACTION_MEDIA_CHECKING)) {
                checkStorage();
            } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) {
                checkStorage();
                if (!mIsImageCaptureIntent)  {
                    updateThumbnailButton();
                }
            }
        }
    };

    private void initializeCameraPicker() {
        mCameraPicker = (CameraPicker) findViewById(R.id.camera_picker);
        if (mCameraPicker != null) {
            mCameraPicker.setImageResource(R.drawable.camera_toggle);
            ListPreference pref = mPreferenceGroup.findPreference(
                    CameraSettings.KEY_CAMERA_ID);
            if (pref != null) {
                mCameraPicker.initialize(pref);
                mCameraPicker.setListener(new MyCameraPickerListener());
            }
        }
    }

    private void initGpsOnScreenIndicator() {
        mGpsNoSignalView = findViewById(R.id.onscreen_gps_indicator_no_signal);
        mGpsHasSignalView = findViewById(R.id.onscreen_gps_indicator_on);
    }

    private void showGpsOnScreenIndicator(boolean hasSignal) {
        if (hasSignal) {
            if (mGpsNoSignalView != null) mGpsNoSignalView.setVisibility(View.INVISIBLE);
            if (mGpsHasSignalView != null) mGpsHasSignalView.setVisibility(View.VISIBLE);
        } else {
            if (mGpsNoSignalView != null) mGpsNoSignalView.setVisibility(View.VISIBLE);
            if (mGpsHasSignalView != null) mGpsHasSignalView.setVisibility(View.INVISIBLE);
        }
    }

    private void hideGpsOnScreenIndicator() {
        if (mGpsNoSignalView != null) mGpsNoSignalView.setVisibility(View.INVISIBLE);
        if (mGpsHasSignalView != null) mGpsHasSignalView.setVisibility(View.INVISIBLE);
    }

    private class LocationListener
            implements android.location.LocationListener {
        Location mLastLocation;
        boolean mValid = false;
        String mProvider;

        public LocationListener(String provider) {
            mProvider = provider;
            mLastLocation = new Location(mProvider);
        }

        public void onLocationChanged(Location newLocation) {
            if (newLocation.getLatitude() == 0.0
                    && newLocation.getLongitude() == 0.0) {
                // Hack to filter out 0.0,0.0 locations
                return;
            }
            // If GPS is available before start camera, we won't get status
            // update so update GPS indicator when we receive data.
            if (mRecordLocation
                    && LocationManager.GPS_PROVIDER.equals(mProvider)) {
                if (mHeadUpDisplay != null) {
                    mHeadUpDisplay.setGpsHasSignal(true);
                }
                showGpsOnScreenIndicator(true);
            }
            if (!mValid) {
                Log.d(TAG, "Got first location.");
            }
            mLastLocation.set(newLocation);
            mValid = true;
        }

        public void onProviderEnabled(String provider) {
        }

        public void onProviderDisabled(String provider) {
            mValid = false;
        }

        public void onStatusChanged(
                String provider, int status, Bundle extras) {
            switch(status) {
                case LocationProvider.OUT_OF_SERVICE:
                case LocationProvider.TEMPORARILY_UNAVAILABLE: {
                    mValid = false;
                    if (mRecordLocation &&
                            LocationManager.GPS_PROVIDER.equals(provider)) {
                        if (mHeadUpDisplay != null) {
                            mHeadUpDisplay.setGpsHasSignal(false);
                        }
                        showGpsOnScreenIndicator(false);
                    }
                    break;
                }
            }
        }

        public Location current() {
            return mValid ? mLastLocation : null;
        }
    }

    private final class ShutterCallback
            implements android.hardware.Camera.ShutterCallback {
        public void onShutter() {
            mShutterCallbackTime = System.currentTimeMillis();
            mShutterLag = mShutterCallbackTime - mCaptureStartTime;
            Log.v(TAG, "mShutterLag = " + mShutterLag + "ms");
            clearFocusState();
        }
    }

    private final class PostViewPictureCallback implements PictureCallback {
        public void onPictureTaken(
                byte [] data, android.hardware.Camera camera) {
            mPostViewPictureCallbackTime = System.currentTimeMillis();
            Log.v(TAG, "mShutterToPostViewCallbackTime = "
                    + (mPostViewPictureCallbackTime - mShutterCallbackTime)
                    + "ms");
        }
    }

    private final class RawPictureCallback implements PictureCallback {
        public void onPictureTaken(
                byte [] rawData, android.hardware.Camera camera) {
            mRawPictureCallbackTime = System.currentTimeMillis();
            Log.v(TAG, "mShutterToRawCallbackTime = "
                    + (mRawPictureCallbackTime - mShutterCallbackTime) + "ms");
        }
    }

    private final class JpegPictureCallback implements PictureCallback {
        Location mLocation;

        public JpegPictureCallback(Location loc) {
            mLocation = loc;
        }

        public void onPictureTaken(
                final byte [] jpegData, final android.hardware.Camera camera) {
            if (mPausing) {
                return;
            }

            mJpegPictureCallbackTime = System.currentTimeMillis();
            // If postview callback has arrived, the captured image is displayed
            // in postview callback. If not, the captured image is displayed in
            // raw picture callback.
            if (mPostViewPictureCallbackTime != 0) {
                mShutterToPictureDisplayedTime =
                        mPostViewPictureCallbackTime - mShutterCallbackTime;
                mPictureDisplayedToJpegCallbackTime =
                        mJpegPictureCallbackTime - mPostViewPictureCallbackTime;
            } else {
                mShutterToPictureDisplayedTime =
                        mRawPictureCallbackTime - mShutterCallbackTime;
                mPictureDisplayedToJpegCallbackTime =
                        mJpegPictureCallbackTime - mRawPictureCallbackTime;
            }
            Log.v(TAG, "mPictureDisplayedToJpegCallbackTime = "
                    + mPictureDisplayedToJpegCallbackTime + "ms");

            if (!mIsImageCaptureIntent) {
                enableCameraControls(true);

                // We want to show the taken picture for a while, so we wait
                // for at least 1.2 second before restarting the preview.
                long delay = 1200 - mPictureDisplayedToJpegCallbackTime;
                if (delay < 0) {
                    restartPreview();
                } else {
                    mHandler.sendEmptyMessageDelayed(RESTART_PREVIEW, delay);
                }
            }
            storeImage(jpegData, camera, mLocation);

            // Check this in advance of each shot so we don't add to shutter
            // latency. It's true that someone else could write to the SD card in
            // the mean time and fill it, but that could have happened between the
            // shutter press and saving the JPEG too.
            checkStorage();

            if (!mHandler.hasMessages(RESTART_PREVIEW)) {
                long now = System.currentTimeMillis();
                mJpegCallbackFinishTime = now - mJpegPictureCallbackTime;
                Log.v(TAG, "mJpegCallbackFinishTime = "
                        + mJpegCallbackFinishTime + "ms");
                mJpegPictureCallbackTime = 0;
            }
        }
    }

    private final class AutoFocusCallback
            implements android.hardware.Camera.AutoFocusCallback {
        public void onAutoFocus(
                boolean focused, android.hardware.Camera camera) {
            mFocusCallbackTime = System.currentTimeMillis();
            mAutoFocusTime = mFocusCallbackTime - mFocusStartTime;
            Log.v(TAG, "mAutoFocusTime = " + mAutoFocusTime + "ms");
            if (mFocusState == FOCUSING_SNAP_ON_FINISH) {
                // Take the picture no matter focus succeeds or fails. No need
                // to play the AF sound if we're about to play the shutter
                // sound.
                if (focused) {
                    mFocusState = FOCUS_SUCCESS;
                } else {
                    mFocusState = FOCUS_FAIL;
                }
                capture();
            } else if (mFocusState == FOCUSING) {
                // User is half-pressing the focus key. Play the focus tone.
                // Do not take the picture now.
                if (focused) {
                    mFocusState = FOCUS_SUCCESS;
                    if (mFocusToneGenerator != null) {
                        mFocusToneGenerator.startTone(ToneGenerator.TONE_PROP_BEEP2);
                    }
                } else {
                    mFocusState = FOCUS_FAIL;
                }
            } else if (mFocusState == FOCUS_NOT_STARTED) {
                // User has released the focus key before focus completes.
                // Do nothing.
            }
            updateFocusIndicator();
        }
    }

    private final class ZoomListener
            implements android.hardware.Camera.OnZoomChangeListener {
        public void onZoomChange(
                int value, boolean stopped, android.hardware.Camera camera) {
            Log.v(TAG, "Zoom changed: value=" + value + ". stopped="+ stopped);
            mZoomValue = value;

            // Update the UI when we get zoom value.
            if (mZoomPicker != null) mZoomPicker.setZoomIndex(value);

            // Keep mParameters up to date. We do not getParameter again in
            // takePicture. If we do not do this, wrong zoom value will be set.
            mParameters.setZoom(value);

            if (stopped && mZoomState != ZOOM_STOPPED) {
                if (mTargetZoomValue != -1 && value != mTargetZoomValue) {
                    mCameraDevice.startSmoothZoom(mTargetZoomValue);
                    mZoomState = ZOOM_START;
                } else {
                    mZoomState = ZOOM_STOPPED;
                }
            }
        }
    }

    public void storeImage(final byte[] data,
            android.hardware.Camera camera, Location loc) {
        if (!mIsImageCaptureIntent) {
            long dateTaken = System.currentTimeMillis();
            String title = createName(dateTaken);

            Storage.Thumbnail thumbnail = Storage.addImage(
                    mContentResolver, title, dateTaken, loc, data);

            if (thumbnail != null && mThumbnailButton != null) {
                mThumbnailButton.setData(thumbnail.getOriginalUri(),
                        thumbnail.getBitmap(mContentResolver));
                mThumbnailButton.setVisibility(View.VISIBLE);

                sendBroadcast(new Intent("com.android.camera.NEW_PICTURE",
                        thumbnail.getOriginalUri()));
            }
        } else {
            mJpegImageData = data;
            if (!mQuickCapture) {
                showPostCaptureAlert();
            } else {
                doAttach();
            }
        }
    }

    private void capture() {
        // If we are already in the middle of taking a snapshot then ignore.
        if (mPausing || mStatus == SNAPSHOT_IN_PROGRESS || mCameraDevice == null) {
            return;
        }
        mCaptureStartTime = System.currentTimeMillis();
        mPostViewPictureCallbackTime = 0;
        enableCameraControls(false);
        mStatus = SNAPSHOT_IN_PROGRESS;
        mJpegImageData = null;

        // See android.hardware.Camera.Parameters.setRotation for
        // documentation.
        int rotation = 0;
        if (mOrientation != OrientationEventListener.ORIENTATION_UNKNOWN) {
            CameraInfo info = CameraHolder.instance().getCameraInfo()[mCameraId];
            if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
                rotation = (info.orientation - mOrientation + 360) % 360;
            } else {  // back-facing camera
                rotation = (info.orientation + mOrientation) % 360;
            }
        }
        mParameters.setRotation(rotation);

        // Clear previous GPS location from the parameters.
        mParameters.removeGpsData();

        // We always encode GpsTimeStamp
        mParameters.setGpsTimestamp(System.currentTimeMillis() / 1000);

        // Set GPS location.
        Location loc = mRecordLocation ? getCurrentLocation() : null;
        if (loc != null) {
            double lat = loc.getLatitude();
            double lon = loc.getLongitude();
            boolean hasLatLon = (lat != 0.0d) || (lon != 0.0d);

            if (hasLatLon) {
                Log.d(TAG, "Set gps location");
                mParameters.setGpsLatitude(lat);
                mParameters.setGpsLongitude(lon);
                mParameters.setGpsProcessingMethod(loc.getProvider().toUpperCase());
                if (loc.hasAltitude()) {
                    mParameters.setGpsAltitude(loc.getAltitude());
                } else {
                    // for NETWORK_PROVIDER location provider, we may have
                    // no altitude information, but the driver needs it, so
                    // we fake one.
                    mParameters.setGpsAltitude(0);
                }
                if (loc.getTime() != 0) {
                    // Location.getTime() is UTC in milliseconds.
                    // gps-timestamp is UTC in seconds.
                    long utcTimeSeconds = loc.getTime() / 1000;
                    mParameters.setGpsTimestamp(utcTimeSeconds);
                }
            } else {
                loc = null;
            }
        }

        mCameraDevice.setParameters(mParameters);

        mCameraDevice.takePicture(mShutterCallback, mRawPictureCallback,
                mPostViewPictureCallback, new JpegPictureCallback(loc));
        mPreviewing = false;
    }

    private boolean saveDataToFile(String filePath, byte[] data) {
        FileOutputStream f = null;
        try {
            f = new FileOutputStream(filePath);
            f.write(data);
        } catch (IOException e) {
            return false;
        } finally {
            Util.closeSilently(f);
        }
        return true;
    }

    private String createName(long dateTaken) {
        Date date = new Date(dateTaken);
        SimpleDateFormat dateFormat = new SimpleDateFormat(
                getString(R.string.image_file_name_format));

        return dateFormat.format(date);
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mIsImageCaptureIntent = isImageCaptureIntent();
        if (mIsImageCaptureIntent) {
            setContentView(R.layout.camera_attach);
        } else {
            setContentView(R.layout.camera);
        }
        mSurfaceView = (SurfaceView) findViewById(R.id.camera_preview);

        mPreferences = new ComboPreferences(this);
        CameraSettings.upgradeGlobalPreferences(mPreferences.getGlobal());

        mCameraId = CameraSettings.readPreferredCameraId(mPreferences);

        //Testing purpose. Launch a specific camera through the intent extras.
        int intentCameraId = Util.getCameraFacingIntentExtras(this);
        if (intentCameraId != -1) {
            mCameraId = intentCameraId;
        }

        mPreferences.setLocalId(this, mCameraId);
        CameraSettings.upgradeLocalPreferences(mPreferences.getLocal());

        mNumberOfCameras = CameraHolder.instance().getNumberOfCameras();
        mQuickCapture = getIntent().getBooleanExtra(EXTRA_QUICK_CAPTURE, false);

        // we need to reset exposure for the preview
        resetExposureCompensation();
        /*
         * To reduce startup time, we start the preview in another thread.
         * We make sure the preview is started at the end of onCreate.
         */
        Thread startPreviewThread = new Thread(new Runnable() {
            public void run() {
                try {
                    mStartPreviewFail = false;
                    startPreview();
                } catch (CameraHardwareException e) {
                    // In eng build, we throw the exception so that test tool
                    // can detect it and report it
                    if ("eng".equals(Build.TYPE)) {
                        throw new RuntimeException(e);
                    }
                    mStartPreviewFail = true;
                }
            }
        });
        startPreviewThread.start();

        // don't set mSurfaceHolder here. We have it set ONLY within
        // surfaceChanged / surfaceDestroyed, other parts of the code
        // assume that when it is set, the surface is also set.
        SurfaceHolder holder = mSurfaceView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        if (mIsImageCaptureIntent) {
            setupCaptureParams();

            View reviewControl = findViewById(R.id.review_control);
            reviewControl.setVisibility(View.VISIBLE);
            reviewControl.findViewById(R.id.btn_cancel).setOnClickListener(this);
            reviewControl.findViewById(R.id.btn_retake).setOnClickListener(this);
            reviewControl.findViewById(R.id.btn_done).setOnClickListener(this);
        } else {
            mSwitcher = (SwitcherSet) findViewById(R.id.camera_switch);
            mSwitcher.setVisibility(View.VISIBLE);
            mSwitcher.setOnSwitchListener(this);
        }

        // Make sure preview is started.
        try {
            startPreviewThread.join();
            if (mStartPreviewFail) {
                showCameraErrorAndFinish();
                return;
            }
        } catch (InterruptedException ex) {
            // ignore
        }

        mBackCameraId = CameraHolder.instance().getBackCameraId();
        mFrontCameraId = CameraHolder.instance().getFrontCameraId();

        // Do this after starting preview because it depends on camera
        // parameters.
        initializeIndicatorWheel();
        initializeCameraPicker();

        mZoomPicker = (ZoomPicker) findViewById(R.id.zoom_picker);
        if (mZoomPicker != null) mZoomPicker.setEnabled(true); // disabled initially in xml
    }

    private void changeHeadUpDisplayState() {
        if (mHeadUpDisplay == null) return;
        // If the camera resumes behind the lock screen, the orientation
        // will be portrait. That causes OOM when we try to allocation GPU
        // memory for the GLSurfaceView again when the orientation changes. So,
        // we delayed initialization of HeadUpDisplay until the orientation
        // becomes landscape.
        Configuration config = getResources().getConfiguration();
        if (config.orientation == Configuration.ORIENTATION_LANDSCAPE
                && !mPausing && mFirstTimeInitialized) {
            if (mGLRootView == null) attachHeadUpDisplay();
        } else if (mGLRootView != null) {
            detachHeadUpDisplay();
        }
    }

    private void overrideCameraSettings(final String flashMode,
            final String whiteBalance, final String focusMode) {
        if (mHeadUpDisplay != null) {
            mHeadUpDisplay.overrideSettings(
                    CameraSettings.KEY_FLASH_MODE, flashMode,
                    CameraSettings.KEY_WHITE_BALANCE, whiteBalance,
                    CameraSettings.KEY_FOCUS_MODE, focusMode);
        }
        if (mIndicatorWheel != null) {
            mIndicatorWheel.overrideSettings(
                    CameraSettings.KEY_FLASH_MODE, flashMode,
                    CameraSettings.KEY_WHITE_BALANCE, whiteBalance,
                    CameraSettings.KEY_FOCUS_MODE, focusMode);
        }
    }

    private void updateSceneModeUI() {
        // If scene mode is set, we cannot set flash mode, white balance, and
        // focus mode, instead, we read it from driver
        if (!Parameters.SCENE_MODE_AUTO.equals(mSceneMode)) {
            overrideCameraSettings(mParameters.getFlashMode(),
                    mParameters.getWhiteBalance(), mParameters.getFocusMode());
        } else {
            overrideCameraSettings(null, null, null);
        }
    }

    private void loadCameraPreferences() {
        CameraSettings settings = new CameraSettings(this, mInitialParams,
                mCameraId, CameraHolder.instance().getCameraInfo());
        mPreferenceGroup = settings.getPreferenceGroup(R.xml.camera_preferences);
    }

    private void initializeIndicatorWheel() {
        mIndicatorWheel = (IndicatorWheel) findViewById(R.id.indicator_wheel);
        if (mIndicatorWheel == null) return;
        loadCameraPreferences();

        String[] keys = new String[]{CameraSettings.KEY_FLASH_MODE,
            CameraSettings.KEY_WHITE_BALANCE,
            CameraSettings.KEY_COLOR_EFFECT,
            CameraSettings.KEY_SCENE_MODE};
        mIndicatorWheel.initialize(this, mPreferenceGroup, keys, true);
        mIndicatorWheel.setListener(new MyIndicatorWheelListener());
        mPopupGestureDetector = new GestureDetector(this,
                new PopupGestureListener());
        updateSceneModeUI();
    }

    private void initializeHeadUpDisplay() {
        if (mHeadUpDisplay == null) return;
        loadCameraPreferences();

        // If we have zoom picker, do not show zoom control on head-up display.
        float[] zoomRatios = null;
        if (mZoomPicker == null) zoomRatios = getZoomRatios();
        mHeadUpDisplay.initialize(this, mPreferenceGroup,
                zoomRatios, mOrientationCompensation);
        if (mZoomPicker == null && mParameters.isZoomSupported()) {
            mHeadUpDisplay.setZoomListener(new ZoomControllerListener() {
                public void onZoomChanged(
                        int index, float ratio, boolean isMoving) {
                    onZoomValueChanged(index);
                }
            });
        }
        updateSceneModeUI();
    }

    private void attachHeadUpDisplay() {
        mHeadUpDisplay.setOrientation(mOrientationCompensation);
        if (mParameters.isZoomSupported()) {
            mHeadUpDisplay.setZoomIndex(mZoomValue);
        }
        ViewGroup frame = (ViewGroup) findViewById(R.id.frame);
        mGLRootView = new GLRootView(this);
        mGLRootView.setContentPane(mHeadUpDisplay);
        frame.addView(mGLRootView);
    }

    private void detachHeadUpDisplay() {
        mHeadUpDisplay.setGpsHasSignal(false);
        mHeadUpDisplay.collapse();
        ((ViewGroup) mGLRootView.getParent()).removeView(mGLRootView);
        mGLRootView = null;
    }

    private boolean collapseCameraControls() {
        if (mHeadUpDisplay != null && mHeadUpDisplay.collapse()) {
            return true;
        }
        if (mIndicatorWheel != null && mIndicatorWheel.dismissSettingPopup()) {
            return true;
        }
        return false;
    }

    private void enableCameraControls(boolean enable) {
        if (mHeadUpDisplay != null) mHeadUpDisplay.setEnabled(enable);
        if (mIndicatorWheel != null) mIndicatorWheel.setEnabled(enable);
        if (mCameraPicker != null) mCameraPicker.setEnabled(enable);
        if (mZoomPicker != null) mZoomPicker.setEnabled(enable);
        if (mSwitcher != null) mSwitcher.setEnabled(enable);
    }

    public static int roundOrientation(int orientation) {
        return ((orientation + 45) / 90 * 90) % 360;
    }

    private class MyOrientationEventListener
            extends OrientationEventListener {
        public MyOrientationEventListener(Context context) {
            super(context);
        }

        @Override
        public void onOrientationChanged(int orientation) {
            // We keep the last known orientation. So if the user first orient
            // the camera then point the camera to floor or sky, we still have
            // the correct orientation.
            if (orientation == ORIENTATION_UNKNOWN) return;
            mOrientation = roundOrientation(orientation);
            // When the screen is unlocked, display rotation may change. Always
            // calculate the up-to-date orientationCompensation.
            int orientationCompensation = mOrientation
                    + Util.getDisplayRotation(Camera.this);
            if (mOrientationCompensation != orientationCompensation) {
                mOrientationCompensation = orientationCompensation;
                if (!mIsImageCaptureIntent) {
                    setOrientationIndicator(mOrientationCompensation);
                }
                if (mHeadUpDisplay != null) {
                    mHeadUpDisplay.setOrientation(mOrientationCompensation);
                }
            }
        }
    }

    private void setOrientationIndicator(int degree) {
        RotateImageView icon = (RotateImageView) findViewById(
                R.id.review_thumbnail);
        if (icon != null) icon.setDegree(degree);

        icon = (RotateImageView) findViewById(R.id.camera_switch_icon);
        if (icon != null) icon.setDegree(degree);
        icon = (RotateImageView) findViewById(R.id.video_switch_icon);
        if (icon != null) icon.setDegree(degree);
    }

    @Override
    public void onStart() {
        super.onStart();
        if (!mIsImageCaptureIntent) {
            mSwitcher.setSwitch(SWITCH_CAMERA);
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mMediaProviderClient != null) {
            mMediaProviderClient.release();
            mMediaProviderClient = null;
        }
    }

    private void checkStorage() {
        mPicturesRemaining = Storage.getAvailableSpace();
        if (mPicturesRemaining > 0) {
            mPicturesRemaining /= 1500000;
        }
        updateStorageHint();
    }

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_retake:
                hidePostCaptureAlert();
                restartPreview();
                break;
            case R.id.review_thumbnail:
                if (isCameraIdle()) {
                    viewImage(mThumbnailButton);
                }
                break;
            case R.id.btn_done:
                doAttach();
                break;
            case R.id.btn_cancel:
                doCancel();
                break;
            case R.id.btn_gallery:
                gotoGallery();
                break;
        }
    }

    private void doAttach() {
        if (mPausing) {
            return;
        }

        byte[] data = mJpegImageData;

        if (mCropValue == null) {
            // First handle the no crop case -- just return the value.  If the
            // caller specifies a "save uri" then write the data to it's
            // stream. Otherwise, pass back a scaled down version of the bitmap
            // directly in the extras.
            if (mSaveUri != null) {
                OutputStream outputStream = null;
                try {
                    outputStream = mContentResolver.openOutputStream(mSaveUri);
                    outputStream.write(data);
                    outputStream.close();

                    setResult(RESULT_OK);
                    finish();
                } catch (IOException ex) {
                    // ignore exception
                } finally {
                    Util.closeSilently(outputStream);
                }
            } else {
                int orientation = Exif.getOrientation(data);
                Bitmap bitmap = Util.makeBitmap(data, 50 * 1024);
                bitmap = Util.rotate(bitmap, orientation);
                setResult(RESULT_OK,
                        new Intent("inline-data").putExtra("data", bitmap));
                finish();
            }
        } else {
            // Save the image to a temp file and invoke the cropper
            Uri tempUri = null;
            FileOutputStream tempStream = null;
            try {
                File path = getFileStreamPath(sTempCropFilename);
                path.delete();
                tempStream = openFileOutput(sTempCropFilename, 0);
                tempStream.write(data);
                tempStream.close();
                tempUri = Uri.fromFile(path);
            } catch (FileNotFoundException ex) {
                setResult(Activity.RESULT_CANCELED);
                finish();
                return;
            } catch (IOException ex) {
                setResult(Activity.RESULT_CANCELED);
                finish();
                return;
            } finally {
                Util.closeSilently(tempStream);
            }

            Bundle newExtras = new Bundle();
            if (mCropValue.equals("circle")) {
                newExtras.putString("circleCrop", "true");
            }
            if (mSaveUri != null) {
                newExtras.putParcelable(MediaStore.EXTRA_OUTPUT, mSaveUri);
            } else {
                newExtras.putBoolean("return-data", true);
            }

            Intent cropIntent = new Intent("com.android.camera.action.CROP");

            cropIntent.setData(tempUri);
            cropIntent.putExtras(newExtras);

            startActivityForResult(cropIntent, CROP_MSG);
        }
    }

    private void doCancel() {
        setResult(RESULT_CANCELED, new Intent());
        finish();
    }

    public void onShutterButtonFocus(ShutterButton button, boolean pressed) {
        if (mPausing) {
            return;
        }
        switch (button.getId()) {
            case R.id.shutter_button:
                doFocus(pressed);
                break;
        }
    }

    public void onShutterButtonClick(ShutterButton button) {
        if (mPausing) {
            return;
        }
        switch (button.getId()) {
            case R.id.shutter_button:
                doSnap();
                break;
        }
    }

    private OnScreenHint mStorageHint;

    private void updateStorageHint() {
        String noStorageText = null;

        if (mPicturesRemaining == Storage.UNAVAILABLE) {
            noStorageText = getString(R.string.no_storage);
        } else if (mPicturesRemaining == Storage.PREPARING) {
            noStorageText = getString(R.string.preparing_sd);
        } else if (mPicturesRemaining == Storage.UNKNOWN_SIZE) {
            noStorageText = getString(R.string.access_sd_fail);
        } else if (mPicturesRemaining < 1L) {
            noStorageText = getString(R.string.not_enough_space);
        }

        if (noStorageText != null) {
            if (mStorageHint == null) {
                mStorageHint = OnScreenHint.makeText(this, noStorageText);
            } else {
                mStorageHint.setText(noStorageText);
            }
            mStorageHint.show();
        } else if (mStorageHint != null) {
            mStorageHint.cancel();
            mStorageHint = null;
        }
    }

    private void installIntentFilter() {
        // install an intent filter to receive SD card related events.
        IntentFilter intentFilter =
                new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);
        intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
        intentFilter.addAction(Intent.ACTION_MEDIA_CHECKING);
        intentFilter.addDataScheme("file");
        registerReceiver(mReceiver, intentFilter);
        mDidRegister = true;
    }

    private void initializeFocusTone() {
        // Initialize focus tone generator.
        try {
            mFocusToneGenerator = new ToneGenerator(
                    AudioManager.STREAM_SYSTEM, FOCUS_BEEP_VOLUME);
        } catch (Throwable ex) {
            Log.w(TAG, "Exception caught while creating tone generator: ", ex);
            mFocusToneGenerator = null;
        }
    }

    private void initializeScreenBrightness() {
        Window win = getWindow();
        // Overright the brightness settings if it is automatic
        int mode = Settings.System.getInt(
                getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
        if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
            WindowManager.LayoutParams winParams = win.getAttributes();
            winParams.screenBrightness = DEFAULT_CAMERA_BRIGHTNESS;
            win.setAttributes(winParams);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        mPausing = false;
        mJpegPictureCallbackTime = 0;
        mZoomValue = 0;

        // Start the preview if it is not started.
        if (!mPreviewing && !mStartPreviewFail) {
            resetExposureCompensation();
            if (!restartPreview()) return;
        }

        if (mSurfaceHolder != null) {
            // If first time initialization is not finished, put it in the
            // message queue.
            if (!mFirstTimeInitialized) {
                mHandler.sendEmptyMessage(FIRST_TIME_INIT);
            } else {
                initializeSecondTime();
            }
        }
        keepScreenOnAwhile();

        if (mPreviewing) {
            mOnResumeTime = SystemClock.uptimeMillis();
            mHandler.sendEmptyMessageDelayed(CHECK_DISPLAY_ROTATION, 100);
        }
    }

    @Override
    public void onConfigurationChanged(Configuration config) {
        super.onConfigurationChanged(config);
        changeHeadUpDisplayState();
    }

    @Override
    protected void onPause() {
        mPausing = true;
        stopPreview();
        // Close the camera now because other activities may need to use it.
        closeCamera();
        resetScreenOn();
        collapseCameraControls();
        changeHeadUpDisplayState();

        if (mFirstTimeInitialized) {
            mOrientationListener.disable();
            if (!mIsImageCaptureIntent) {
                if (mThumbnailButton != null) {
                    mThumbnailButton.storeData(LAST_THUMB_PATH);
                }
            }
            hidePostCaptureAlert();
        }

        if (mDidRegister) {
            unregisterReceiver(mReceiver);
            mDidRegister = false;
        }
        stopReceivingLocationUpdates();

        if (mFocusToneGenerator != null) {
            mFocusToneGenerator.release();
            mFocusToneGenerator = null;
        }

        if (mStorageHint != null) {
            mStorageHint.cancel();
            mStorageHint = null;
        }

        // If we are in an image capture intent and has taken
        // a picture, we just clear it in onPause.
        mJpegImageData = null;

        // Remove the messages in the event queue.
        mHandler.removeMessages(RESTART_PREVIEW);
        mHandler.removeMessages(FIRST_TIME_INIT);
        mHandler.removeMessages(CHECK_DISPLAY_ROTATION);

        super.onPause();
    }

    @Override
    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case CROP_MSG: {
                Intent intent = new Intent();
                if (data != null) {
                    Bundle extras = data.getExtras();
                    if (extras != null) {
                        intent.putExtras(extras);
                    }
                }
                setResult(resultCode, intent);
                finish();

                File path = getFileStreamPath(sTempCropFilename);
                path.delete();

                break;
            }
        }
    }

    private boolean canTakePicture() {
        return isCameraIdle() && mPreviewing && (mPicturesRemaining > 0);
    }

    private void autoFocus() {
        // Initiate autofocus only when preview is started and snapshot is not
        // in progress.
        if (canTakePicture()) {
            enableCameraControls(false);
            Log.v(TAG, "Start autofocus.");
            mFocusStartTime = System.currentTimeMillis();
            mFocusState = FOCUSING;
            updateFocusIndicator();
            mCameraDevice.autoFocus(mAutoFocusCallback);
        }
    }

    private void cancelAutoFocus() {
        // User releases half-pressed focus key.
        if (mStatus != SNAPSHOT_IN_PROGRESS && (mFocusState == FOCUSING
                || mFocusState == FOCUS_SUCCESS || mFocusState == FOCUS_FAIL)) {
            Log.v(TAG, "Cancel autofocus.");
            enableCameraControls(true);
            mCameraDevice.cancelAutoFocus();
        }
        if (mFocusState != FOCUSING_SNAP_ON_FINISH) {
            clearFocusState();
        }
    }

    private void clearFocusState() {
        mFocusState = FOCUS_NOT_STARTED;
        updateFocusIndicator();
    }

    private void updateFocusIndicator() {
        if (mFocusRectangle == null) return;

        if (mFocusState == FOCUSING || mFocusState == FOCUSING_SNAP_ON_FINISH) {
            mFocusRectangle.showStart();
        } else if (mFocusState == FOCUS_SUCCESS) {
            mFocusRectangle.showSuccess();
        } else if (mFocusState == FOCUS_FAIL) {
            mFocusRectangle.showFail();
        } else {
            mFocusRectangle.clear();
        }
    }

    @Override
    public void onBackPressed() {
        if (!isCameraIdle()) {
            // ignore backs while we're taking a picture
            return;
        } else if (!collapseCameraControls()) {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_FOCUS:
                if (mFirstTimeInitialized && event.getRepeatCount() == 0) {
                    doFocus(true);
                }
                return true;
            case KeyEvent.KEYCODE_CAMERA:
                if (mFirstTimeInitialized && event.getRepeatCount() == 0) {
                    doSnap();
                }
                return true;
            case KeyEvent.KEYCODE_DPAD_CENTER:
                // If we get a dpad center event without any focused view, move
                // the focus to the shutter button and press it.
                if (mFirstTimeInitialized && event.getRepeatCount() == 0) {
                    // Start auto-focus immediately to reduce shutter lag. After
                    // the shutter button gets the focus, doFocus() will be
                    // called again but it is fine.
                    if (collapseCameraControls()) return true;
                    doFocus(true);
                    if (mShutterButton.isInTouchMode()) {
                        mShutterButton.requestFocusFromTouch();
                    } else {
                        mShutterButton.requestFocus();
                    }
                    mShutterButton.setPressed(true);
                }
                return true;
        }

        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_FOCUS:
                if (mFirstTimeInitialized) {
                    doFocus(false);
                }
                return true;
        }
        return super.onKeyUp(keyCode, event);
    }

    private void doSnap() {
        if (collapseCameraControls()) return;

        Log.v(TAG, "doSnap: mFocusState=" + mFocusState);
        // If the user has half-pressed the shutter and focus is completed, we
        // can take the photo right away. If the focus mode is infinity, we can
        // also take the photo.
        if (mFocusMode.equals(Parameters.FOCUS_MODE_INFINITY)
                || mFocusMode.equals(Parameters.FOCUS_MODE_FIXED)
                || mFocusMode.equals(Parameters.FOCUS_MODE_EDOF)
                || (mFocusState == FOCUS_SUCCESS
                || mFocusState == FOCUS_FAIL)) {
            capture();
        } else if (mFocusState == FOCUSING) {
            // Half pressing the shutter (i.e. the focus button event) will
            // already have requested AF for us, so just request capture on
            // focus here.
            mFocusState = FOCUSING_SNAP_ON_FINISH;
        } else if (mFocusState == FOCUS_NOT_STARTED) {
            // Focus key down event is dropped for some reasons. Just ignore.
        }
    }

    private void doFocus(boolean pressed) {
        // Do the focus if the mode is not infinity.
        if (collapseCameraControls()) return;
        if (!(mFocusMode.equals(Parameters.FOCUS_MODE_INFINITY)
                  || mFocusMode.equals(Parameters.FOCUS_MODE_FIXED)
                  || mFocusMode.equals(Parameters.FOCUS_MODE_EDOF))) {
            if (pressed) {  // Focus key down.
                autoFocus();
            } else {  // Focus key up.
                cancelAutoFocus();
            }
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Make sure we have a surface in the holder before proceeding.
        if (holder.getSurface() == null) {
            Log.d(TAG, "holder.getSurface() == null");
            return;
        }

        Log.v(TAG, "surfaceChanged. w=" + w + ". h=" + h);

        // We need to save the holder for later use, even when the mCameraDevice
        // is null. This could happen if onResume() is invoked after this
        // function.
        mSurfaceHolder = holder;

        // The mCameraDevice will be null if it fails to connect to the camera
        // hardware. In this case we will show a dialog and then finish the
        // activity, so it's OK to ignore it.
        if (mCameraDevice == null) return;

        // Sometimes surfaceChanged is called after onPause or before onResume.
        // Ignore it.
        if (mPausing || isFinishing()) return;

        // Set preview display if the surface is being created. Preview was
        // already started. Also restart the preview if display rotation has
        // changed. Sometimes this happens when the device is held in portrait
        // and camera app is opened. Rotation animation takes some time and
        // display rotation in onCreate may not be what we want.
        if (mPreviewing && (Util.getDisplayRotation(this) == mDisplayRotation)
                && holder.isCreating()) {
            // Set preview display if the surface is being created and preview
            // was already started. That means preview display was set to null
            // and we need to set it now.
            setPreviewDisplay(holder);
        } else {
            // 1. Restart the preview if the size of surface was changed. The
            // framework may not support changing preview display on the fly.
            // 2. Start the preview now if surface was destroyed and preview
            // stopped.
            restartPreview();
        }

        // If first time initialization is not finished, send a message to do
        // it later. We want to finish surfaceChanged as soon as possible to let
        // user see preview first.
        if (!mFirstTimeInitialized) {
            mHandler.sendEmptyMessage(FIRST_TIME_INIT);
        } else {
            initializeSecondTime();
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        stopPreview();
        mSurfaceHolder = null;
    }

    private void closeCamera() {
        if (mCameraDevice != null) {
            CameraHolder.instance().release();
            mCameraDevice.setZoomChangeListener(null);
            mCameraDevice = null;
            mPreviewing = false;
        }
    }

    private void ensureCameraDevice() throws CameraHardwareException {
        if (mCameraDevice == null) {
            mCameraDevice = CameraHolder.instance().open(mCameraId);
            mInitialParams = mCameraDevice.getParameters();
        }
    }

    private void showCameraErrorAndFinish() {
        Resources ress = getResources();
        Util.showFatalErrorAndFinish(Camera.this,
                ress.getString(R.string.camera_error_title),
                ress.getString(R.string.cannot_connect_camera));
    }

    private boolean restartPreview() {
        try {
            startPreview();
        } catch (CameraHardwareException e) {
            showCameraErrorAndFinish();
            return false;
        }
        return true;
    }

    private void setPreviewDisplay(SurfaceHolder holder) {
        try {
            mCameraDevice.setPreviewDisplay(holder);
        } catch (Throwable ex) {
            closeCamera();
            throw new RuntimeException("setPreviewDisplay failed", ex);
        }
    }

    private void startPreview() throws CameraHardwareException {
        if (mPausing || isFinishing()) return;

        ensureCameraDevice();
        mCameraDevice.setErrorCallback(mErrorCallback);

        // If we're previewing already, stop the preview first (this will blank
        // the screen).
        if (mPreviewing) stopPreview();

        setPreviewDisplay(mSurfaceHolder);
        mDisplayRotation = Util.getDisplayRotation(this);
        Util.setCameraDisplayOrientation(mDisplayRotation, mCameraId, mCameraDevice);
        setCameraParameters(UPDATE_PARAM_ALL);


        try {
            Log.v(TAG, "startPreview");
            mCameraDevice.startPreview();
        } catch (Throwable ex) {
            closeCamera();
            throw new RuntimeException("startPreview failed", ex);
        }
        mPreviewing = true;
        mZoomState = ZOOM_STOPPED;
        mStatus = IDLE;
    }

    private void stopPreview() {
        if (mCameraDevice != null && mPreviewing) {
            Log.v(TAG, "stopPreview");
            mCameraDevice.stopPreview();
        }
        mPreviewing = false;
        // If auto focus was in progress, it would have been canceled.
        clearFocusState();
    }

    private static boolean isSupported(String value, List<String> supported) {
        return supported == null ? false : supported.indexOf(value) >= 0;
    }

    private void updateCameraParametersInitialize() {
        // Reset preview frame rate to the maximum because it may be lowered by
        // video camera application.
        List<Integer> frameRates = mParameters.getSupportedPreviewFrameRates();
        if (frameRates != null) {
            Integer max = Collections.max(frameRates);
            mParameters.setPreviewFrameRate(max);
        }

    }

    private void updateCameraParametersZoom() {
        // Set zoom.
        if (mParameters.isZoomSupported()) {
            mParameters.setZoom(mZoomValue);
        }
    }

    private void updateCameraParametersPreference() {
        // Set picture size.
        String pictureSize = mPreferences.getString(
                CameraSettings.KEY_PICTURE_SIZE, null);
        if (pictureSize == null) {
            CameraSettings.initialCameraPictureSize(this, mParameters);
        } else {
            List<Size> supported = mParameters.getSupportedPictureSizes();
            CameraSettings.setCameraPictureSize(
                    pictureSize, supported, mParameters);
        }

        // Set the preview frame aspect ratio according to the picture size.
        Size size = mParameters.getPictureSize();
        PreviewFrameLayout frameLayout =
                (PreviewFrameLayout) findViewById(R.id.frame_layout);
        frameLayout.setAspectRatio((double) size.width / size.height);

        // Set a preview size that is closest to the viewfinder height and has
        // the right aspect ratio.
        List<Size> sizes = mParameters.getSupportedPreviewSizes();
        Size optimalSize = Util.getOptimalPreviewSize(this,
                sizes, (double) size.width / size.height);
        Size original = mParameters.getPreviewSize();
        if (!original.equals(optimalSize)) {
            mParameters.setPreviewSize(optimalSize.width, optimalSize.height);

            // Zoom related settings will be changed for different preview
            // sizes, so set and read the parameters to get lastest values
            mCameraDevice.setParameters(mParameters);
            mParameters = mCameraDevice.getParameters();
        }
        Log.v(TAG, "Preview size is " + optimalSize.width + "x" + optimalSize.height);

        // Since change scene mode may change supported values,
        // Set scene mode first,
        mSceneMode = mPreferences.getString(
                CameraSettings.KEY_SCENE_MODE,
                getString(R.string.pref_camera_scenemode_default));
        if (isSupported(mSceneMode, mParameters.getSupportedSceneModes())) {
            if (!mParameters.getSceneMode().equals(mSceneMode)) {
                mParameters.setSceneMode(mSceneMode);
                mCameraDevice.setParameters(mParameters);

                // Setting scene mode will change the settings of flash mode,
                // white balance, and focus mode. Here we read back the
                // parameters, so we can know those settings.
                mParameters = mCameraDevice.getParameters();
            }
        } else {
            mSceneMode = mParameters.getSceneMode();
            if (mSceneMode == null) {
                mSceneMode = Parameters.SCENE_MODE_AUTO;
            }
        }

        // Set JPEG quality.
        String jpegQuality = mPreferences.getString(
                CameraSettings.KEY_JPEG_QUALITY,
                getString(R.string.pref_camera_jpegquality_default));
        mParameters.setJpegQuality(JpegEncodingQualityMappings.getQualityNumber(jpegQuality));

        // For the following settings, we need to check if the settings are
        // still supported by latest driver, if not, ignore the settings.

        // Set color effect parameter.
        String colorEffect = mPreferences.getString(
                CameraSettings.KEY_COLOR_EFFECT,
                getString(R.string.pref_camera_coloreffect_default));
        if (isSupported(colorEffect, mParameters.getSupportedColorEffects())) {
            mParameters.setColorEffect(colorEffect);
        }

        // Set exposure compensation
        String exposure = mPreferences.getString(
                CameraSettings.KEY_EXPOSURE,
                getString(R.string.pref_exposure_default));
        try {
            int value = Integer.parseInt(exposure);
            int max = mParameters.getMaxExposureCompensation();
            int min = mParameters.getMinExposureCompensation();
            if (value >= min && value <= max) {
                mParameters.setExposureCompensation(value);
            } else {
                Log.w(TAG, "invalid exposure range: " + exposure);
            }
        } catch (NumberFormatException e) {
            Log.w(TAG, "invalid exposure: " + exposure);
        }

        if (Parameters.SCENE_MODE_AUTO.equals(mSceneMode)) {
            // Set flash mode.
            String flashMode = mPreferences.getString(
                    CameraSettings.KEY_FLASH_MODE,
                    getString(R.string.pref_camera_flashmode_default));
            List<String> supportedFlash = mParameters.getSupportedFlashModes();
            if (isSupported(flashMode, supportedFlash)) {
                mParameters.setFlashMode(flashMode);
            } else {
                flashMode = mParameters.getFlashMode();
                if (flashMode == null) {
                    flashMode = getString(
                            R.string.pref_camera_flashmode_no_flash);
                }
            }

            // Set white balance parameter.
            String whiteBalance = mPreferences.getString(
                    CameraSettings.KEY_WHITE_BALANCE,
                    getString(R.string.pref_camera_whitebalance_default));
            if (isSupported(whiteBalance,
                    mParameters.getSupportedWhiteBalance())) {
                mParameters.setWhiteBalance(whiteBalance);
            } else {
                whiteBalance = mParameters.getWhiteBalance();
                if (whiteBalance == null) {
                    whiteBalance = Parameters.WHITE_BALANCE_AUTO;
                }
            }

            // Set focus mode.
            mFocusMode = mPreferences.getString(
                    CameraSettings.KEY_FOCUS_MODE,
                    getString(R.string.pref_camera_focusmode_default));
            if (isSupported(mFocusMode, mParameters.getSupportedFocusModes())) {
                mParameters.setFocusMode(mFocusMode);
            } else {
                mFocusMode = mParameters.getFocusMode();
                if (mFocusMode == null) {
                    mFocusMode = Parameters.FOCUS_MODE_AUTO;
                }
            }
        } else {
            mFocusMode = mParameters.getFocusMode();
        }
    }

    // We separate the parameters into several subsets, so we can update only
    // the subsets actually need updating. The PREFERENCE set needs extra
    // locking because the preference can be changed from GLThread as well.
    private void setCameraParameters(int updateSet) {
        mParameters = mCameraDevice.getParameters();

        if ((updateSet & UPDATE_PARAM_INITIALIZE) != 0) {
            updateCameraParametersInitialize();
        }

        if ((updateSet & UPDATE_PARAM_ZOOM) != 0) {
            updateCameraParametersZoom();
        }

        if ((updateSet & UPDATE_PARAM_PREFERENCE) != 0) {
            updateCameraParametersPreference();
        }

        mCameraDevice.setParameters(mParameters);
    }

    // If the Camera is idle, update the parameters immediately, otherwise
    // accumulate them in mUpdateSet and update later.
    private void setCameraParametersWhenIdle(int additionalUpdateSet) {
        mUpdateSet |= additionalUpdateSet;
        if (mCameraDevice == null) {
            // We will update all the parameters when we open the device, so
            // we don't need to do anything now.
            mUpdateSet = 0;
            return;
        } else if (isCameraIdle()) {
            setCameraParameters(mUpdateSet);
            updateSceneModeUI();
            mUpdateSet = 0;
        } else {
            if (!mHandler.hasMessages(SET_CAMERA_PARAMETERS_WHEN_IDLE)) {
                mHandler.sendEmptyMessageDelayed(
                        SET_CAMERA_PARAMETERS_WHEN_IDLE, 1000);
            }
        }
    }

    private void gotoGallery() {
        MenuHelper.gotoCameraImageGallery(this);
    }

    private void viewImage(RotateImageView view) {
        if(!view.isUriValid()) {
            Log.e(TAG, "Uri invalid. uri=" + view.getUri());
            return;
        }

        try {
            startActivity(new Intent(
                    Util.REVIEW_ACTION, view.getUri()));
        } catch (ActivityNotFoundException ex) {
            try {
                startActivity(new Intent(
                        Intent.ACTION_VIEW, view.getUri()));
            } catch (ActivityNotFoundException e) {
                Log.e(TAG, "review image fail. uri=" + view.getUri(), e);
            }
        }
    }

    private void startReceivingLocationUpdates() {
        if (mLocationManager != null) {
            try {
                mLocationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        1000,
                        0F,
                        mLocationListeners[1]);
            } catch (java.lang.SecurityException ex) {
                Log.i(TAG, "fail to request location update, ignore", ex);
            } catch (IllegalArgumentException ex) {
                Log.d(TAG, "provider does not exist " + ex.getMessage());
            }
            try {
                mLocationManager.requestLocationUpdates(
                        LocationManager.GPS_PROVIDER,
                        1000,
                        0F,
                        mLocationListeners[0]);
                showGpsOnScreenIndicator(false);
            } catch (java.lang.SecurityException ex) {
                Log.i(TAG, "fail to request location update, ignore", ex);
            } catch (IllegalArgumentException ex) {
                Log.d(TAG, "provider does not exist " + ex.getMessage());
            }
            Log.d(TAG, "startReceivingLocationUpdates");
        }
    }

    private void stopReceivingLocationUpdates() {
        if (mLocationManager != null) {
            for (int i = 0; i < mLocationListeners.length; i++) {
                try {
                    mLocationManager.removeUpdates(mLocationListeners[i]);
                } catch (Exception ex) {
                    Log.i(TAG, "fail to remove location listners, ignore", ex);
                }
            }
            Log.d(TAG, "stopReceivingLocationUpdates");
        }
        hideGpsOnScreenIndicator();
    }

    private Location getCurrentLocation() {
        // go in best to worst order
        for (int i = 0; i < mLocationListeners.length; i++) {
            Location l = mLocationListeners[i].current();
            if (l != null) return l;
        }
        Log.d(TAG, "No location received yet.");
        return null;
    }

    private boolean isCameraIdle() {
        return mStatus == IDLE && mFocusState == FOCUS_NOT_STARTED;
    }

    private boolean isImageCaptureIntent() {
        String action = getIntent().getAction();
        return (MediaStore.ACTION_IMAGE_CAPTURE.equals(action));
    }

    private void setupCaptureParams() {
        Bundle myExtras = getIntent().getExtras();
        if (myExtras != null) {
            mSaveUri = (Uri) myExtras.getParcelable(MediaStore.EXTRA_OUTPUT);
            mCropValue = myExtras.getString("crop");
        }
    }

    private void showPostCaptureAlert() {
        if (mIsImageCaptureIntent) {
            if (mIndicatorWheel == null) {
                mShutterButton.setVisibility(View.INVISIBLE);
            } else {
                mShutterButton.setEnabled(false);
            }
            int[] pickIds = {R.id.btn_retake, R.id.btn_done};
            for (int id : pickIds) {
                View button = findViewById(id);
                ((View) button.getParent()).setVisibility(View.VISIBLE);
            }

            // Remove the text of the cancel button
            View view = findViewById(R.id.btn_cancel);
            if (view instanceof Button) ((Button) view).setText("");
        }
    }

    private void hidePostCaptureAlert() {
        if (mIsImageCaptureIntent) {
            if (mIndicatorWheel == null) {
                mShutterButton.setVisibility(View.VISIBLE);
            } else {
                mShutterButton.setEnabled(true);
            }
            int[] pickIds = {R.id.btn_retake, R.id.btn_done};
            for (int id : pickIds) {
                View button = findViewById(id);
                ((View) button.getParent()).setVisibility(View.GONE);
            }
            enableCameraControls(true);

            // Restore the text of the cancel button
            View view = findViewById(R.id.btn_cancel);
            if (view instanceof Button) {
                ((Button) view).setText(R.string.review_cancel);
            }
        }
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);
        // Only show the menu when camera is idle.
        for (int i = 0; i < menu.size(); i++) {
            menu.getItem(i).setVisible(isCameraIdle());
        }

        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        if (mIsImageCaptureIntent) {
            // No options menu for attach mode.
            return false;
        } else {
            addBaseMenuItems(menu);
        }
        return true;
    }

    private void addBaseMenuItems(Menu menu) {
        MenuHelper.addSwitchModeMenuItem(menu, true, new Runnable() {
            public void run() {
                switchToVideoMode();
            }
        });
        MenuItem gallery = menu.add(Menu.NONE, Menu.NONE,
                MenuHelper.POSITION_GOTO_GALLERY,
                R.string.camera_gallery_photos_text)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
            public boolean onMenuItemClick(MenuItem item) {
                gotoGallery();
                return true;
            }
        });
        gallery.setIcon(android.R.drawable.ic_menu_gallery);
        mGalleryItems.add(gallery);

        if (mNumberOfCameras > 1) {
            menu.add(Menu.NONE, Menu.NONE,
                    MenuHelper.POSITION_SWITCH_CAMERA_ID,
                    R.string.switch_camera_id)
                    .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                public boolean onMenuItemClick(MenuItem item) {
                    CameraSettings.writePreferredCameraId(mPreferences,
                            ((mCameraId == mFrontCameraId)
                            ? mBackCameraId : mFrontCameraId));
                    onSharedPreferenceChanged();
                    return true;
                }
            }).setIcon(android.R.drawable.ic_menu_camera);
        }
    }

    private boolean switchToVideoMode() {
        if (isFinishing() || !isCameraIdle()) return false;
        MenuHelper.gotoVideoMode(Camera.this);
        mHandler.removeMessages(FIRST_TIME_INIT);
        finish();
        return true;
    }

    public boolean onSwitchChanged(Switcher source, boolean onOff) {
        if (onOff == SWITCH_VIDEO) {
            return switchToVideoMode();
        } else {
            return true;
        }
    }

    private void onSharedPreferenceChanged() {
        // ignore the events after "onPause()"
        if (mPausing) return;

        boolean recordLocation;

        recordLocation = RecordLocationPreference.get(
                mPreferences, getContentResolver());

        if (mRecordLocation != recordLocation) {
            mRecordLocation = recordLocation;
            if (mRecordLocation) {
                startReceivingLocationUpdates();
            } else {
                stopReceivingLocationUpdates();
            }
        }
        int cameraId = CameraSettings.readPreferredCameraId(mPreferences);
        if (mCameraId != cameraId) {
            // Restart the activity to have a crossfade animation.
            // TODO: Use SurfaceTexture to implement a better and faster
            // animation.
            MenuHelper.gotoCameraMode(this);
            finish();
        } else {
            setCameraParametersWhenIdle(UPDATE_PARAM_PREFERENCE);
        }
    }

    @Override
    public void onUserInteraction() {
        super.onUserInteraction();
        keepScreenOnAwhile();
    }

    private void resetScreenOn() {
        mHandler.removeMessages(CLEAR_SCREEN_DELAY);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }

    private void keepScreenOnAwhile() {
        mHandler.removeMessages(CLEAR_SCREEN_DELAY);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        mHandler.sendEmptyMessageDelayed(CLEAR_SCREEN_DELAY, SCREEN_DELAY);
    }

    private class MyHeadUpDisplayListener implements HeadUpDisplay.Listener {

        public void onSharedPreferenceChanged() {
            Camera.this.onSharedPreferenceChanged();
        }

        public void onRestorePreferencesClicked() {
            Camera.this.onRestorePreferencesClicked();
        }

        public void onPopupWindowVisibilityChanged(int visibility) {
        }
    }

    protected void onRestorePreferencesClicked() {
        if (mPausing) return;
        Runnable runnable = new Runnable() {
            public void run() {
                restorePreferences();
            }
        };
        MenuHelper.confirmAction(this,
                getString(R.string.confirm_restore_title),
                getString(R.string.confirm_restore_message),
                runnable);
    }

    private void restorePreferences() {
        // Reset the zoom. Zoom value is not stored in preference.
        if (mParameters.isZoomSupported()) {
            mZoomValue = 0;
            setCameraParametersWhenIdle(UPDATE_PARAM_ZOOM);
            if (mZoomPicker != null) mZoomPicker.setZoomIndex(0);
        }

        if (mHeadUpDisplay != null) {
            mHeadUpDisplay.restorePreferences(mParameters);
        }

        if (mIndicatorWheel != null) {
            mIndicatorWheel.dismissSettingPopup();
            CameraSettings.restorePreferences(Camera.this, mPreferences,
                    mParameters);
            initializeIndicatorWheel();
            onSharedPreferenceChanged();
        }
    }

    protected void onOverriddenPreferencesClicked() {
        if (mPausing) return;
        if (mNotSelectableToast == null) {
            String str = getResources().getString(R.string.not_selectable_in_scene_mode);
            mNotSelectableToast = Toast.makeText(Camera.this, str, Toast.LENGTH_SHORT);
        }
        mNotSelectableToast.cancel();
        mNotSelectableToast.show();
    }

    private class MyIndicatorWheelListener implements IndicatorWheel.Listener {
        public void onSharedPreferenceChanged() {
            Camera.this.onSharedPreferenceChanged();
        }

        public void onRestorePreferencesClicked() {
            Camera.this.onRestorePreferencesClicked();
        }

        public void onOverriddenPreferencesClicked() {
            Camera.this.onOverriddenPreferencesClicked();
        }
    }

    private class MyCameraPickerListener implements CameraPicker.Listener {
        public void onSharedPreferenceChanged() {
            Camera.this.onSharedPreferenceChanged();
        }
    }
}